[imageio] Fix reading of palette-based PNGs with transparency #18031
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Merged in master and 5.0.x branch. |
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Fixes #17991.
We need to call
png_set_strip_alphafor images with transparency to ensure that decoding does not produce 4 channels instead of the expected 3. The original code restricted the call conditions of this function too much, and it was not called for indexed color images with the tRNS chunk.